[PATCH] Remove racy check_mem_region() call from pcbit_drv.c

From:  Bob Miller <rem@osdl.org>

  Removed the check_mem_region() call and replaced with request_mem_region().

drivers/isdn/pcbit/drv.c

@@ -87,15 +87,13 @@ int pcbit_init_dev(int board, int mem_base, int irq)
 
 	if (mem_base >= 0xA0000 && mem_base <= 0xFFFFF ) {
 		dev->ph_mem = mem_base;
-		if (check_mem_region(dev->ph_mem, 4096)) {
+		if (!request_mem_region(dev->ph_mem, 4096, "PCBIT mem")) {
 			printk(KERN_WARNING
 				"PCBIT: memory region %lx-%lx already in use\n",
 				dev->ph_mem, dev->ph_mem + 4096);
 			kfree(dev);
 			dev_pcbit[board] = NULL;
 			return -EACCES;
-		} else {
-			request_mem_region(dev->ph_mem, 4096, "PCBIT mem");
 		}
 		dev->sh_mem = (unsigned char*)ioremap(dev->ph_mem, 4096);
 	}